/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 62536
 * Date: 2024-06-08
 * Time: 10:35
 */
public class Solution {
    public int wiggleMaxLength(int[] nums) {
        int n = nums.length;
        if(n < 2){
            return n;
        }

        int ret = 0, left = 0;
        for (int i = 0; i < n-1; i++) {
            int right = nums[i+1] - nums[i];
            if(right == 0){
                continue;
            }
            if(right * left <= 0){
                ret++;
            }
            left = right;

        }

        return ret+1;
    }
}
